The 5,125-year cycle in the ancient Maya calendar draws to an ominous end on Friday.
Could this be it?
We can't offer shelter from Armageddon. We can't even provide sticky tape should 'zero hour' merely result in a reversal of the Earth's magnetic field.
But we will be monitoring the planet's vital signs throughout the course of the day, bringing you the best doomsday stories from across our stricken world.
Follow our coverage - live: